# CVE-2026-83508: Windows NTFS out-of-bounds read privilege escalation

Source: https://junglewise.ai/threats/cve-2026-83508-out-of-bounds-read-in-windows-ntfs-allows-an-authorized-attacker  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-83508 · Severity: high · CVSS 7.8 · Published 2026-10-13

Windows NTFS, the file system that stores and manages data on Windows computers, contains an out-of-bounds read vulnerability that allows an authorized local user to escalate their privileges to a higher level of system access. An attacker with a valid local account could exploit this flaw to gain administrative control of the machine and compromise its security.

Technologies: [Microsoft Windows NTFS](https://junglewise.ai/threats/technologies/windows-ntfs). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-83508 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-83508 being exploited in the wild.

**How severe is CVE-2026-83508?** High severity, with a CVSS score of 7.8, published 13 October 2026.

**Which products and versions are affected?** Microsoft Windows NTFS.

**Is there a fix for CVE-2026-83508?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-83508 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-83508?** Check whether you run Microsoft Windows NTFS. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds read vulnerability exists in Windows NTFS that can be exploited by an authenticated local attacker to achieve privilege escalation. The vulnerability requires local access and valid user credentials; it does not require user interaction. Exploitation allows an attacker to escalate from a standard user account to a higher privilege level.

## Affected products

- Microsoft Windows NTFS

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83508](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83508)

## Related threats

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- [Windows NTFS improper access control information disclosure](https://junglewise.ai/threats/cve-2026-83864-improper-access-control-in-windows-ntfs-allows-an-authorized)
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- [Windows NTFS integer overflow allows privilege escalation](https://junglewise.ai/threats/cve-2026-69916-integer-overflow-or-wraparound-in-windows-ntfs-allows-an)
- [Microsoft Windows NTFS out-of-bounds read privilege escalation](https://junglewise.ai/threats/cve-2026-77503-microsoft-windows-ntfs-out-of-bounds-read-privilege-escalation)